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Bert22306
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re: Impulse radio sets record for distance measurement
Bert22306   4/18/2013 7:30:06 PM
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I guess the new name makes this a novel idea. It sounds very much like a primitive form of radar, however, which in turn is an RF rendition of sonar.

EREBUS0
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re: Impulse radio sets record for distance measurement
EREBUS0   4/18/2013 8:08:15 PM
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Hi Bert22306, I agree, RTT techniques is old news. Given the current state of clocks and timing, such accuracy is not a big surprise. Just my opinion.

Mark Barry
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re: Impulse radio sets record for distance measurement
Mark Barry   4/19/2013 3:24:06 PM
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A few cm accuracy at 880 metres with UWB IR is close to 2 orders of magnitude improvement on the previous state-of-the-art. Saying it is not novel/surprising is like saying that a GHz pentium running at 70mW is not novel or surprising.

y_sasaki
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re: Impulse radio sets record for distance measurement
y_sasaki   4/19/2013 6:41:50 PM
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Ever since ill-fated IEEE802.15.3a UWB fiasco, I've been fascinated with possibility of the pure impulse radio. It is glad to hear there are people still exploring this technology. By the way isn't "IR" short for Impulse Radio could be confusing with InfraRed?

palf
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re: Impulse radio sets record for distance measurement
palf   4/24/2013 6:37:13 PM
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Not particularly impressive, considering acam of Germany's TDC-GP22 and -GPX chips, which get down to mm accuracy (sub 30 ps). And they're cheap ($20 ish). TDC is straight LIDAR; the chief advantages of UWB are noise immunity and non-line-of-sight use. Time Domain also compete here on UWB, but they are pricey ($2K per Tx/Rx).



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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